(DISCLAIMER: This is not my work, I don't take any credit for it the original post can be found on IGN.com )

Grand Theft Auto Online, the multiplayer component to Grand Theft Auto V, will launch two weeks after Grand Theft Auto V. It will be free for everyone who bought a copy of the game.

Grand Theft Auto Online is a dynamic and persistent online world for 16 players that begins by sharing gameplay features, geography and mechanics with Grand Theft Auto V, but will continue to expand and evolve after its launch with new content created by Rockstar Games and the Grand Theft Auto community, according to Rockstar.[1]

The game will let you and friends team up to tackle missions, activities, ambient events and other things, as well as competing with others in more traditional game modes.

When playing Grand Theft Auto Online, you take the role of a custom character. With this character, you can customize your appearance, increase stats, and own property and cars. You use this character to earn reputation and money to open up new opportunities for you and your friends.

'Crews', which have been seen recently seen in Max Payne 3, will also be used in Grand Theft Auto V. The 'Crew' mechanic makes use of Rockstar's Social Club, which has been in use since the release of Red Dead Redemption. By creating a 'Crew' in a game such as Max Payne 3, players will be able to port across their character between the two games.

Rockstar boss Dan Houser said: "Multiplayer is an ever-more important part of all our games moving forward. By creating crews through Social Club, the crews that you create in Max Payne 3 will be ready and available for you to play in Grand Theft Auto V from day one."

GTA V will let players form private crews with friends, or join public crews. Players can be a member of up to five at the same time, and completing tasks as a crew will gain experience points for the player. In late 2012, Rockstar said that "refining open-world multiplayer into something really special" had been a huge focus in the development of GTA V.

((( My only problem is that I wish they said this before the game was released because I literally wanted to play it purely for the Online thing, but 2 weeks isn't that long......I think)))
(Source: http://www.ign.com/wikis/gta-5/Grand_Theft_Auto_Online)

Riiight, so you don't get to make a custom character in the main game, which I'm sure is what people want more -_-

There isn't much you can do to make Niko Bellic look even remotely attractive

Lol right every time i'd try to dress up Niko it felt like I was trying to pick clothes out for someones father or something. but October isn't "that" far away i'm just mad they didn't say anything, because they wanted to keep everyone's money.